RPN-55 SD
CuVee Software
Getting the latest details from the App Store…
CuVee Software
Getting the latest details from the App Store…
RPN-55 SD is the first photo-realistic simulation for the iPhone of Hewlett-Packard's low-cost alternative to the famous HP-65 programmable scientific calculator. Produced from 1975 through 1977, it was the "Merlin" member of the classic HP calculator series, priced at $395. HP claimed that it featured "(...) more pre-programmed functions than any other scientific pocket calculator in the world." A main feature of the HP-55 was a crystal-controlled 100-hr digital timer with the ability to…
Top of Paid · Productivity in United States. RPN-55 SD is #84 there. Changes are over 7 days.
How the app presents itself on the App Store. Select a screenshot to open it full size.
Version 3.3 · 17 Oct 2025 · 11 months ago
• Improved compatibility with iPhone Air and iOS 26.
Every chart this app is in right now, best position first.
| Chart | Rank | 24 h | 7 days | Best | Days on chart |
|---|---|---|---|---|---|
Higher on the chart is better: #1 is at the top.
Their other apps that Appulse has seen in the charts, charting ones first.
| App | Best rank now | Released | App Store |
|---|---|---|---|
 RPN-65 SDProductivity | Paid · ProductivityUnited States#99 |
| #84 |
| New entry |
| Change unknown |
| #84 |
| 1 |
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United States · Paid · Productivity: best #84, latest #84, over 7 snapshots since 8 Oct. No snapshots from 8 Oct to 9 Oct, on 9 Oct, on 10 Oct, and on 11 Oct; the line joins the snapshots on either side.
Entries, big moves, #1s and new versions we've recorded.
 RPN-25 CEUtilities | Not charting | 6 years ago |
